Detector



E. J. HAVERSTICK DETECTOR Fild June 28. 1923 K m r. 3 RW v T d wH a H Y dB 5 ATTORNEY A v v PENivsx v N IA:nssielvolt;'ro wnsrmenonsfi ELnoTmo-a NUFACTURINGoolu-rnmg aoonronarron OEPENNSYLVANIAU P en May 31,1927.

. EARL JFHAVERSTICK, or :o'AKMonT;

. A lic a tio n filed J un'e :2 8,

My invention relates to rectifiers' of the type in which acrystal coacts with a metalv vention is the provision of materials for de- 5 tectors that will produce improved results In another broad aspect, the invention has for its object to provide a support for the contacting metal which will enable its contact with the crystal to be maintained effectively even when the contacting metal is softer than those heretofore used. ,7

More specifically stated, one object of my invention is to provide a metal of qualities superior to those-of the-metals heretofore used in detectors of the crystal? contact type and a correlated object is to provide an arrangement wherein the; necessary contact I pressure may be secured, with aluminum wire, Wl'llCll is so soft that unassisted 1t will bend when an attempt to produce the.

contacting pressure is made. If. the wire. bends, no effective pressure is produced between thev metal and the crystal and so proper rectification will not be secured.

These and other objects of my invention will be made more apparentby reference to the accompanying drawings, wherein the single figure 1s-a side elevatlonal vlewof a V detector embodying my invention. 4 In the figure,'the crystal 1 of any of the substances which are sensitive or have sensitive spots is contacted by a metallic element or .cat-

' analogous properties.

whisker 2. The crystal may beof galena,

silicon, C&I'bOI1111dl1II1,OI' any substance of The cat-whisker 2, which is of alumi num wire, is bent near the end ofthewire into the form of a hook 3,-the convex round-' ed face of which engages the crystal, This affords a different type of contact surface from the usual beveled or pointed end which;

has heretofore been used. I find that by v avoiding. sharpened or beveled ends .that v sensitive spots are more easily 'found and are less likely to have their sensltiveness. de-

stroyed by accidental subjectionto heavy 1 tained with pure aluminum than with the current.

I have found that better results are obvarious alloys. of aluminum heretofore used; To take ad ant ge pf th s s reri o y, I

1523. 3 seam; 643228. 7

make the cat-whisker of aluminum wire, but such wire is soft andbends easily. I

' In order that the softwire may sustain the necessary pressure between the hook- 3 and the crystal 1, the wire has been rein- V forced'throughout the greater portion of j I its length by bending it back and forth upon .itself as shown at 4. i The, end of the wire] is then wrapped around the bundle of lengths made by this bendingg as shown at 5. Thisresults in a sufliciently rigid, thick-V ened' part of the cat-whisker, so that by the usual adjustingmeans, the end 3 can be made to press against the crystal l with v out such pressure having to'be sustained by a long, slender soft wire; Such a Wire r V would bend under the needed pressure and thus-make an ineffective contact. w

any convenient manner. For the purpose of; illustrating this construction, I have shown a clamp 6 of thesplitsocket type resiliently engaging'oneend of-the bundle oflengtlis 14.1 Arod 7 whichiextends tothje if usual adjustable mounting is securedin any desired way to the clamp 6. r

of my invention it will be apparent to; those H The cat-whisker, may be: mounted in i While I haveshown but Oneembodi m t 1 .0 I

skilled in 'theart that various changes and modifications maybe made intheapparatusf i illustrated Without departing from the-spirit and scope of my invention, asset forth in the appended claims; '3 w I I claim as my invention;

1. In a detector, awire bent upon to form a plurality of parallelly extending lengthsand wound around said bent por- 2. In a detector,"a wire of the Fcatwhisker? type bent upon itself to form a plurality of parallelly extending lengths and wound around said bent portions tos addry 9o tions to additionally reinforce the same tionally reinforcethe same, one end ofsaid.

wire extending beyond saidlengt hs to .con-.

stitute a contact member;

3. A rectifierfcomprising a sensitive crys- I tal, an aluminum wire, the wire'being bent; upon". itself whereby, a portion thereof is reinforced, a clamp engaging one end of thev I reinforcedfportion, said wirehavinga bend beyond the other end of'the reinforced porf ai ben tion, the roundedportion write-d g he crystal, I 

